<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
        <div id="app">
                <input type="radio" v-model="picked" value="html" id="html">
                <label for="html">HTML</label>
                <br>
                <input type="radio" v-model="picked" value="js" id="js">
                <label for="js">JavaScript</label>
                <br>
                <input type="radio" v-model="picked" value="css" id="css">
                <label for="css">CSS</label>
                <br>
                <p>选择项目是：{{picked}}</p>
            </div>
            <script src="https://cdn.jsdelivr.net/npm/vue"></script>
            <script>
                var app= new Vue({
                    el: '#app',
                    data:{
                        picked: 'js'
                    }
                })
            </script>
</body>
</html>